A highperformance jet plane practicing radar avoidance maneu

A high-performance jet plane, practicing radar avoidance maneuvers, is in horizontal flight 45.0 m above the level ground. Suddenly, the plane encounters terrain that slopes gently upward at 3.50°, an amount difficult to detect. How much time does the pilot have to make a correction to avoid flying into the ground ( s)? The speed of the plane is 1150 km/h.

Solution

speed of plane =1150kph = (1,150,000m/ 3600s) = 319.44m/sec.
Distance to meet ground = 45/(tan 3.5), = 735.74 metres.
Time available = (735.74/319.44) = 2.30 secs.